Description
Ronstan Series 20 Ball Bearing Block | Boat Supply Store
This Ronstan Series 20 Ball Bearing Block provides superior low-friction performance and robust load capacity for critical control lines on smaller vessels. Its precision Acetal sheaves rotate on stainless steel ball bearings, facilitating effortless adjustment under load. With a working load limit (MWL) of 250kg (550lbs) and a maximum rope diameter of 6mm (1/4"), it's engineered for demanding applications like vangs or traveler controls on dinghies and small keelboats.
Key Features
- Low Friction performance for effortless line adjustment.
- High Load Capacity for demanding control lines.
- Lightweight Construction at only 20g (0.7oz).
- Precision Acetal Sheaves for smooth operation.
- Stainless Steel Ball Bearings ensure minimal friction.
- UV Stabilized components for extended durability.
- Impact and UV Resistant fiber reinforced Nylon cheeks.
- Grade 316 Stainless Steel load strap and head fitting.
Specifications
| Product Specifications | |
|---|---|
| Sheave Ø | 20mm (3/4") |
| Max. Rope Ø | 6mm (1/4") |
| Pin Ø | 3mm (1/8") |
| M.W.L. | 250kg (550lbs) |
| B.L. | 550kg (1,210lbs) |
| Weight | 20g (0.7oz) |
| Sheave Material | Acetal |
| Bearing Type | Stainless steel ball bearings |
| Cheek Material | Fiber reinforced Nylon |
| Load Strap Material | Grade 316 stainless steel |
| Head Fitting Material | Grade 316 stainless steel |
Who This Is For
Dinghy sailors and crews on small keelboats will benefit from this high-performance block for precise control line management. It's ideal for any boater needing a compact, durable, and low-friction solution for systems up to approximately 20 feet LOA.
How It Compares
| Feature | Ronstan Series 20 Ball Bearing Block | Competitor |
|---|---|---|
| Sheave Ø | 20mm (3/4") | — |
| Max. Rope Ø | 6mm (1/4") | — |
| M.W.L. | 250kg (550lbs) | — |
| Weight | 20g (0.7oz) | 15g |
| Bearing Type | Stainless steel ball bearings | Carbo-Lite bearings |
| Sheave Material | Acetal | Carbo-Lite |
Common Concerns Answered
Are there any common complaints about this block?
No widespread complaints are reported for this specific Ronstan model, indicating a high level of user satisfaction and reliable performance. Users appreciate its smooth operation and durability.
Is it difficult to ensure optimal performance with this block?
Optimal performance is best achieved by ensuring the correct rope diameter is used, as specified up to 6mm (1/4"). Proper sizing prevents unnecessary friction or wear.
How does this block compare to others in terms of load rating?
With a 250kg (550lbs) working load limit, this Ronstan block offers a competitive load capacity for its size, often exceeding similar diameter blocks from other manufacturers, making it a robust choice for critical systems.
Frequently Asked Questions
What is the maximum rope diameter this Ronstan Series 20 block can accommodate?
The maximum rope diameter this Ronstan Series 20 Ball Bearing Block can accommodate is 6mm (1/4").
What is the working load limit (MWL) for the Ronstan Series 20 Ball Bearing Block?
The working load limit (MWL) for the Ronstan Series 20 Ball Bearing Block is 250kg (550lbs).
What are the typical applications for the Ronstan Series 20 Ball Bearing Block?
Typical applications include control lines, vangs, cunninghams, and traveler controls on dinghies and small keelboats, up to approximately 20 feet LOA.
What materials are used in the construction of the Ronstan Series 20 Ball Bearing Block?
The block features precision molded Acetal sheaves, stainless steel ball bearings, fiber reinforced Nylon cheeks, and Grade 316 stainless steel load strap and head fitting.
How does the ball bearing system in this Ronstan block contribute to its performance?
The stainless steel ball bearing system significantly reduces friction between the sheave and the block body, allowing for smoother operation, easier adjustments, and a higher mechanical advantage when loading control lines.